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 for The extraction of roots
From The Collaborative International Dictionary of English v.0.48 :

  Extraction \Ex*trac"tion\, n. [Cf. F. extraction.]
     1. The act of extracting, or drawing out; as, the extraction
        of a tooth, of a bone or an arrow from the body, of a
        stump from earth, of a passage from a book, of an essence
        or tincture.
        [1913 Webster]
     2. Derivation from a stock or family; lineage; descent;
        birth; the stock from which one has descended. "A family
        of ancient extraction." --Clarendon.
        [1913 Webster]
     3. That which is extracted; extract; essence.
        [1913 Webster]
              They [books] do preserve as in a vial the purest
              efficacy and extraction of that living intellect
              that bred them.                       --Milton.
        [1913 Webster]
     The extraction of roots. (Math.)
        (a) The operation of finding the root of a given number or
        (b) The method or rule by which the operation is
            performed; evolution.
            [1913 Webster]

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